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✏️ Editing: minus.decTest

------------------------------------------------------------------------
-- minus.decTest -- decimal negation                                  --
-- Copyright (c) IBM Corporation, 1981, 2008.  All rights reserved.   --
------------------------------------------------------------------------
-- Please see the document "General Decimal Arithmetic Testcases"     --
-- at http://www2.hursley.ibm.com/decimal for the description of      --
-- these testcases.                                                   --
--                                                                    --
-- These testcases are experimental ('beta' versions), and they       --
-- may contain errors.  They are offered on an as-is basis.  In       --
-- particular, achieving the same results as the tests here is not    --
-- a guarantee that an implementation complies with any Standard      --
-- or specification.  The tests are not exhaustive.                   --
--                                                                    --
-- Please send comments, suggestions, and corrections to the author:  --
--   Mike Cowlishaw, IBM Fellow                                       --
--   IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK         --
--   mfc@uk.ibm.com                                                   --
------------------------------------------------------------------------
version: 2.59

-- This set of tests primarily tests the existence of the operator.
-- Subtraction, rounding, and more overflows are tested elsewhere.

extended:    1
precision:   9
rounding:    half_up
maxExponent: 384
minexponent: -383

minx001 minus '1'      -> '-1'
minx002 minus '-1'     -> '1'
minx003 minus '1.00'   -> '-1.00'
minx004 minus '-1.00'  -> '1.00'
minx005 minus '0'      -> '0'
minx006 minus '0.00'   -> '0.00'
minx007 minus '00.0'   -> '0.0'
minx008 minus '00.00'  -> '0.00'
minx009 minus '00'     -> '0'

minx010 minus '-2'     -> '2'
minx011 minus '2'      -> '-2'
minx012 minus '-2.00'  -> '2.00'
minx013 minus '2.00'   -> '-2.00'
minx014 minus '-0'     -> '0'
minx015 minus '-0.00'  -> '0.00'
minx016 minus '-00.0'  -> '0.0'
minx017 minus '-00.00' -> '0.00'
minx018 minus '-00'    -> '0'

-- "lhs" zeros in plus and minus have exponent = operand
minx020 minus '-0E3'   -> '0E+3'
minx021 minus '-0E2'   -> '0E+2'
minx022 minus '-0E1'   -> '0E+1'
minx023 minus '-0E0'   -> '0'
minx024 minus '+0E0'   -> '0'
minx025 minus '+0E1'   -> '0E+1'
minx026 minus '+0E2'   -> '0E+2'
minx027 minus '+0E3'   -> '0E+3'

minx030 minus '-5E3'   -> '5E+3'
minx031 minus '-5E8'   -> '5E+8'
minx032 minus '-5E13'  -> '5E+13'
minx033 minus '-5E18'  -> '5E+18'
minx034 minus '+5E3'   -> '-5E+3'
minx035 minus '+5E8'   -> '-5E+8'
minx036 minus '+5E13'  -> '-5E+13'
minx037 minus '+5E18'  -> '-5E+18'

minx050 minus '-2000000' -> '2000000'
minx051 minus '2000000'  -> '-2000000'
precision: 7
minx052 minus '-2000000' -> '2000000'
minx053 minus '2000000'  -> '-2000000'
precision: 6
minx054 minus '-2000000' -> '2.00000E+6' Rounded
minx055 minus '2000000'  -> '-2.00000E+6' Rounded
precision: 3
minx056 minus '-2000000' -> '2.00E+6' Rounded
minx057 minus '2000000'  -> '-2.00E+6' Rounded

-- more fixed, potential LHS swaps/overlays if done by 0 subtract x
precision: 9
minx060 minus '56267E-10'   -> '-0.0000056267'
minx061 minus '56267E-5'    -> '-0.56267'
minx062 minus '56267E-2'    -> '-562.67'
minx063 minus '56267E-1'    -> '-5626.7'
minx065 minus '56267E-0'    -> '-56267'
minx066 minus '56267E+0'    -> '-56267'
minx067 minus '56267E+1'    -> '-5.6267E+5'
minx068 minus '56267E+2'    -> '-5.6267E+6'
minx069 minus '56267E+3'    -> '-5.6267E+7'
minx070 minus '56267E+4'    -> '-5.6267E+8'
minx071 minus '56267E+5'    -> '-5.6267E+9'
minx072 minus '56267E+6'    -> '-5.6267E+10'
minx080 minus '-56267E-10'  -> '0.0000056267'
minx081 minus '-56267E-5'   -> '0.56267'
minx082 minus '-56267E-2'   -> '562.67'
minx083 minus '-56267E-1'   -> '5626.7'
minx085 minus '-56267E-0'   -> '56267'
minx086 minus '-56267E+0'   -> '56267'
minx087 minus '-56267E+1'   -> '5.6267E+5'
minx088 minus '-56267E+2'   -> '5.6267E+6'
minx089 minus '-56267E+3'   -> '5.6267E+7'
minx090 minus '-56267E+4'   -> '5.6267E+8'
minx091 minus '-56267E+5'   -> '5.6267E+9'
minx092 minus '-56267E+6'   -> '5.6267E+10'

-- overflow tests
maxexponent: 999999999
minexponent: -999999999
precision: 3
minx100 minus 9.999E+999999999  -> -Infinity Inexact Overflow Rounded
minx101 minus -9.999E+999999999 ->  Infinity Inexact Overflow Rounded

-- subnormals and underflow
precision: 3
maxexponent: 999
minexponent: -999
minx110 minus  1.00E-999        ->  -1.00E-999
minx111 minus  0.1E-999         ->  -1E-1000   Subnormal
minx112 minus  0.10E-999        ->  -1.0E-1000 Subnormal
minx113 minus  0.100E-999       ->  -1.0E-1000 Subnormal Rounded
minx114 minus  0.01E-999        ->  -1E-1001   Subnormal
-- next is rounded to Emin
minx115 minus  0.999E-999       ->  -1.00E-999 Inexact Rounded Subnormal Underflow
minx116 minus  0.099E-999       ->  -1.0E-1000 Inexact Rounded Subnormal Underflow
minx117 minus  0.009E-999       ->  -1E-1001   Inexact Rounded Subnormal Underflow
minx118 minus  0.001E-999       ->  -0E-1001   Inexact Rounded Subnormal Underflow Clamped
minx119 minus  0.0009E-999      ->  -0E-1001   Inexact Rounded Subnormal Underflow Clamped
minx120 minus  0.0001E-999      ->  -0E-1001   Inexact Rounded Subnormal Underflow Clamped

minx130 minus -1.00E-999        ->   1.00E-999
minx131 minus -0.1E-999         ->   1E-1000   Subnormal
minx132 minus -0.10E-999        ->   1.0E-1000 Subnormal
minx133 minus -0.100E-999       ->   1.0E-1000 Subnormal Rounded
minx134 minus -0.01E-999        ->   1E-1001   Subnormal
-- next is rounded to Emin
minx135 minus -0.999E-999       ->   1.00E-999 Inexact Rounded Subnormal Underflow
minx136 minus -0.099E-999       ->   1.0E-1000 Inexact Rounded Subnormal Underflow
minx137 minus -0.009E-999       ->   1E-1001   Inexact Rounded Subnormal Underflow
minx138 minus -0.001E-999       ->   0E-1001   Inexact Rounded Subnormal Underflow Clamped
minx139 minus -0.0009E-999      ->   0E-1001   Inexact Rounded Subnormal Underflow Clamped
minx140 minus -0.0001E-999      ->   0E-1001   Inexact Rounded Subnormal Underflow Clamped

-- long operand checks
maxexponent: 999
minexponent: -999
precision: 9
minx301 minus 12345678000  -> -1.23456780E+10 Rounded
minx302 minus 1234567800   -> -1.23456780E+9 Rounded
minx303 minus 1234567890   -> -1.23456789E+9 Rounded
minx304 minus 1234567891   -> -1.23456789E+9 Inexact Rounded
minx305 minus 12345678901  -> -1.23456789E+10 Inexact Rounded
minx306 minus 1234567896   -> -1.23456790E+9 Inexact Rounded

precision: 15
-- still checking
minx321 minus 12345678000  -> -12345678000
minx322 minus 1234567800   -> -1234567800
minx323 minus 1234567890   -> -1234567890
minx324 minus 1234567891   -> -1234567891
minx325 minus 12345678901  -> -12345678901
minx326 minus 1234567896   -> -1234567896

-- specials
minx420 minus 'Inf'    -> '-Infinity'
minx421 minus '-Inf'   -> 'Infinity'
minx422 minus   NaN    ->  NaN
minx423 minus  sNaN    ->  NaN    Invalid_operation
minx424 minus   NaN255 ->  NaN255
minx425 minus  sNaN256 ->  NaN256 Invalid_operation
minx426 minus  -NaN    -> -NaN
minx427 minus -sNaN    -> -NaN    Invalid_operation
minx428 minus  -NaN255 -> -NaN255
minx429 minus -sNaN256 -> -NaN256 Invalid_operation

-- Null tests
minx900 minus  # -> NaN Invalid_operation

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